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 3. Transmission Policies and Standards

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ON THIS PAGE

 * Policies for Customer Connections
 * Technical Standards for Customer Connections
 * Offshore
 * Connection Offer Process
 * Disclaimer


TRANSMISSION POLICIES AND STANDARDS

Our guidance on policies and technical standards for connections to the grid.




POLICIES FOR CUSTOMER CONNECTIONS

EirGrid plans, manages, develops and operates the national electricity
transmission grid. As part of this, we manage Transmission Investment Policies.
These set out the acceptable standards and regulations for transmission
developments.

We engage with stakeholders when developing or changing our technical standards
and policies. This is specifically true when changes could significantly
increase customer project costs or planning requirements.

See our engagement process in the document below.


Technical Standards and Policies Engagement Process (PDF, 232KB)


TRANSMISSION POLICY DOCUMENTS

 * Access to TSO Current and Voltage Instrument Transformer Cores
 * Policy on Wind Turbine Clearance to OHL’s
 * Policy on Calculation of the Maximum Fault Level for Substation Earth Grid
   Design
 * Busbar Configuration for 110, 220 and 400 kV Transmission Substations
 * Transmission Line and Solar Farm Guideline Clearances
 * Options for Connecting Customers to the Transmission Network




TECHNICAL STANDARDS FOR CUSTOMER CONNECTIONS

Part of our role is to set technical standards for proposed transmission system
connections. These standards govern the design and construction of new
transmission assets, including:

 * Transmission substations
 * Cables
 * Overhead lines

We also provide guidance for proposed developments close to existing
transmission infrastructure.

Below is a non-exhaustive list of technical standard documents for demand and
generation customers to consider.


FUNCTIONAL SPECIFICATIONS

 * 110/220/400kV Station General Requirements (XDS-GFS-00-001-R4)
 * 110kV/220kV/400kV Underground Cable Specification (CDS-GFS-00-001-R1)
 * 110kV Underground Cable Drawings
 * 110/220/400 kV GIS Specification (XDS-GFS-25-001-R4) - Currently Under Review
 * Control, Protection and Metering Specification (XDS-GFS-06-001-R2)
 * Station Auxiliary Power Supplies Specification (XDS-GFS-08-001-R3)
 * Earthing and Lightning Protection (XDS-GFS-12-001-R4)
 * Earthing and Lightning Protection Drawings (XDS-DGA-00-004-R04)
 * Station 220 V, 48V and 24 V Lead Acid Batteries and Chargers
   (XDS-GFS-09-001-R4) - Currently Under Review
 * Substation Civil and Building Works (XDS-GFS-13-001-R2) - Currently Under
   Review

Standard Layout Drawings

100 kV

 * 110 kV AIS Substation - 8 Bay (XDN-LAY-ELV-STND-H-001-R08)
 * 110kV AIS Single Transformer Tail Station (XDN-LAY-ELV-STND-H-003-R04)
 * 110 kV Single Bay Extendable to C-type Station (XDN-LAY-ELV-STND-H-006-R00) -
   Currently Under Review
 * 110kV AIS Station Typical Control Room (XDN-CR-STND-H-001-R01)
 * 110 kV GIS Station - 8 Bay (XDN-LAY-ELV-STND-H-005-

220 kV

 * 220 kV GIS Substation - Single Bay (XDN-LAY-ELEV-STND-F-002-R00)
 * 220 kV GIS Substation - 8 Bay (XDN-LAY-ELEV-STND-F-005-R00)
 * 220 kV GIS Substation - 12 Bay (XDN-LAY-ELEV-STND-F-004-R01)

Standard Single Line Diagrams

 * Customer 110kV AIS C-Type SLD (XDN-SLD-STND-H-005-R03)
 * Customer 110kV GIS C-Type SLD (XDN-SLD-STND-H-006-R02)

 




OFFSHORE TECHNICAL STANDARDS FOR CUSTOMER CONNECTIONS


GENERAL FUNCTIONAL SPECIFICATIONS

 * SCADA and Telecommunications (OFS-GEN-15-R2)
 * Control & Protection and Metering (OFS-GEN-16-R2)


EXPORT CABLES FUNCTIONAL SPECIFICATIONS

 * 220kV Submarine Cables (OFS-CAB-100-R3)
 * 220 kV and 400 kV Onshore Underground Cables (OFS-CAB-101-R2)


OFFSHORE SUBSTATION FUNCTIONAL SPECIFICATIONS

 * General Requirements (OFS-OSP-130-R2)
 * Primary Electrical Systems (OFS-OSP-135-R2)
 * Auxiliary Electrical Systems (OFS-OSP-136-R2)


ONSHORE COMPENSATION COMPOUND FUNCTIONAL SPECIFICATIONS

 * Onshore Compensation Compound General Requirements (OFS-SSS-400-R2)
 * Control and Protection Cabinets and Marshalling Kiosks (OFS-SSS-402-R1)
 * Onshore Compensation Compound Auxiliary Power Supplies (OFS-SSS-403-R1)
 * 220V Lead Acid Batteries and Chargers (OFS-SSS-404-R1)
 * 220V DC and 230/400V AC Distribution Boards (OFS-SSS-405-R1)
 * Auxiliary Cable and Wiring System (OFS-SSS-406-R1)
 * Earthing and Lightning Protection (OFS-SSS-407-R2)
 * Fire Detection and Alarm Systems (OFS-SSS-409-R1)
 * 220/400kV Gas Insulated Switchgear (GIS) (OFS-SSS-413-R2)
 * 400kV and 220kV Harmonic Filter (OFS-SSS-414-R2)
 * 400kV and 220kV Shunt Reactor (OFS-SSS-415-R2)
 * 400 kV, 220 kV and 110 kV Static Synchronous Compensator (STATCOM)
   (OFS-SSS-416-R2)
 * Onshore Compensation Compound Civil and Building Works (OFS-SSS-417-R1)
 * Electrical & Mechanical Services for Transmission System Control Buildings
   and Compound (OFS-SSS-418-R1)
 * Galvanised Fabricated Steelwork (OFS-SSS-419-R1)
 * Hot Dip Galvanising of Iron and Steel Other Than Wire (OFS-SSS-420-R1)
 * Steel Masts & Girders (OFS-SSS-421-R1)
 * 220kV Circuit Breakers for Air Insulated Stations (OFS-SSS-422-R1)
 * 220kV Disconnectors and Earth Switches for Air Insulated Stations
   (OFS-SSS-423-R1)
 * 220kV Instrument Transformers (OFS-SSS-424-R1)
 * 220kV Surge Arresters (OFS-SSS-425-R1)
 * 220kV Post Insulators for Air Insulated Switchgear (OFS-SSS-426-R1)


EIRGRID OFFSHORE STANDARD LAYOUT DRAWINGS

 * 220kV GIS Onshore Compensation Compound Layout - Drawing 1 and Drawing 2
   (OFD-SSS-503-R00)
 * 220kV AIS Onshore Compensation Compound Layout (OFD-SSS-501-R00)


EIRGRID OFFSHORE STANDARD SINGLE LINE DIAGRAMS

 * 220kV AIS Onshore Compensation Compound Diagram (OFD-SSS-500-R00)
 * 220kV GIS Onshore Compensation Compound Diagram (OFD-SSS-502-R00)




CONNECTION OFFER PROCESS

The standard layout drawings here are concept designs of the most commonly
acceptable solutions. They are provided for guidance only.

Detailed project specific documentation is provided to applicants who have
executed a connection offer with EirGrid. For more on the connection offer
process, see our section on becoming a customer.


Becoming a Customer



DISCLAIMER

Information provided to customers on this website contains general and technical
information, which is subject to change from time to time without notice. 

EirGrid makes no warranties or representations of any kind with respect to the
general and technical information provided or the content of any other document
or website referred to on this website. 

EirGrid cannot determine any proposed connection methods until the formal
connection application process is completed. Until an application is submitted
and the relevant detailed studies and an executed connection agreement are
complete, EirGrid will not be in a position to confirm specific technical
details. 

Customers should not act or refrain from acting on the basis of any information
provided without seeking appropriate professional advice.

Use of the information provided is solely at the user's own risk. EirGrid does
not accept liability for any loss or damage arising from use or reliance on the
information provided.

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